Tapinella panuoides

Tapinella panuoides, also known as oyster rollrim, and as fan pax from its former binomial Paxillus panuoides, is a fungus species in the genus Tapinella.

Atromentin is a phenolic compound. The first enzymes in its biosynthesis have been characterised in T. panuoides.

Despite its pleasant taste, the species is poisonous. In North America it can be confused with poisonous western jack o'lanterns, edible chanterelle mushrooms, false chanterelles (Hygrophoropsis aurantiaca), Crepidotus, or Phyllotopsis.

It grows on wood or in "lignin-rich humus," has little or no stalk where it emerges from the substrate, and the gills appear to be crimped, forked, or crosshatched close to the base.